Hi Turbo Marian,
Thanks again for bringing this to the AnswerHub, and most especially for attaching the logs. 
I’m going to see if we can get more eyes on your issue. In the meantime, when you tried manually signing your apk using jarsigner, did you get any sort of error? Something like “invalid entry compressed size”? If you did, please have a look at this thread, which may help. If you didn’t, no worries, we’re still working on it.
Thanks very much!